RE: DAmmit : Part II

["Ng, Kevin (NationsCredit)" <kevin.ng@nationscredit.com>]

OK, I don't have any definitive proof of this, just passing along what I
read--the MFA and speedo are reading from different sources. The MFA uses a
sensor at the wheel (measures something like every 1/4 turn of the wheel),
while the speedo takes its reading from an electronic sensor somewhere in
the tranny area. Why the speedo sensor is located by the tranny is a
complete mystery to me. Why VW uses two different sensor readings is a
complete mystery to me. My only guess is that, like some other car
maufacturers, VW intentionally makes the speedometer readings a little high,
just to avoid complaints. What I do know for sure is that there have been
plenty of reports stating that the MFA is indeed accurate, showing your true
speed, while the speedo gauge is slow by about 4%. So, if Flyin's GLX was
totally stock and indicated 144 mph, with the 4% error actual speed was 138.
Still higher than the published top speed limiter though....

Kevin Ng
97 GLX Windsor Blue


> -----Original Message-----
> From:	FlyinVR6 [SMTP:FlyinVR6@li.net]
> Sent:	Friday, September 04, 1998 4:16 PM
> To:	jettaglx@igtc.com
> Subject:	RE: DAmmit : Part II
> 
> .....exactly the point.....i want to hear someone explain that.....
>  
> >>What's wierd to me is if both the computer and the analog gauge are
> reading from the same source and they're both electronic. Why aren't they
> both calibrated to the same degree of accuracy? <<
> 
> FlyinVR6 
> ICQ : 8994103 
> AIM : SwiftVR6 
> \X/ Real Drivers Wanted \X/ 
> <http://members.aol.com/qwikvr6/index.html> 
> 
> 	-----Original Message-----
> 	From: owner-jettaglx@igtc.com [mailto:owner-jettaglx@igtc.com]On
> Behalf Of Sean E. Mulch
> 	Sent: Friday, September 04, 1998 9:25 AM
> 	To: jettaglx@igtc.com
> 	Subject: Re: DAmmit : Part II
> 	
> 	
> 	That's true it does sound funky! 
> 
> 	Consider this though. A few weeks ago I'm driving in a residential
> area on a 25mph road. On a straight stretch of road. there's this radar
> trailer. You know the kind that measures your speed and displays it on
> this big screen that says: "You are going : x mph." 
> 
> 	Well I was doing about 35 mph and it displayed about 32 mph. 
> 
> 	Now that's funky! 
> 
> 	What's wierd to me is if both the computer and the analog gauge are
> reading from the same source and they're both electronic. Why aren't they
> both calibrated to the same degree of accuracy? 
> 
> 	FlyinVR6 wrote: 
> 
> 		 It's hard for me to believe that there is that much of a
> difference between the computer and the speedo needle. I'm thinking that
> the computer is lower due to the fact that it is programmed to take the
> average mph of your drive time. I know that you're thinking..."Well if I'm
> going a constant 70, then the computer average should be 70 too...."
> Maybe, maybe not. If you closely watch your speedo during cruise control,
> it does NOT stay at a constant speed. It will drop off 3-5mph every now
> and then before the engine kicks in to maintain the proper setting. Also,
> if u think about it......having 66 displayed on your computer while your
> speedo is reading 70 is a huge difference at that speed. That means when
> you're doing 35mph, you're actually doing 33mph. That's too big a margin
> of error for me to believe with all the technology we have packed in our
> cars these days. I don't know enough about the on-board diagnostics of our
> cars to give any technical info to support my idea, but it just sounds too
> funky to me.FlyinVR6 
> 		ICQ : 8994103 
> 		AIM : SwiftVR6 
> 		\X/ Real Drivers Wanted \X/ 
> 		<http://members.aol.com/qwikvr6/index.html>
> 
> 	  
>